Bicycle frame



FIG. 1 is a front perspective view of a bicycle frame;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a left side elevation view thereof;

FIG. 5 is a right side elevation view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines shown in the drawings depict portions of a bicycle and a bicycle frame that form no part of the claimed invention. 

CLAIM The ornamental design for a bicycle frame, as shown and described. 